Laboratory evaluation of adhesives improves weather-resistant films for chemical repellents on Pseudotsuga menziesii, indicating potential for enhanced foliar application.
Thirty-nine commercial adhesives were evaluated for their ability to form weather-resistant films for retaining chemical repellents on coniferous trees. Fifteen were rejected because of poor film retention in accelerated weathering tests or because they could not be formulated as 10-percent solids in water. The rest received advanced laboratory evaluations designed to measure film quality on Pseudotsuga menziesii (Mirb.) Franco seedlings. None appeared phytotoxic. The 10 judged to form the highest-quality films were tested on seedlings exposed in the nursery for 3 months and for 1 year. Four acrylic-based adhesives weathered best for both periods. No adhesive was statistically superior to the widely used acrylic, Rhoplex AC-33.
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Bullard et al. (1968) studied this question.
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